Breeding Question

I have a question about breeding LF Black Ameraucana . I currently have 3 hens and 1 roo. I have 8 eggs in the bator. Now, when these eggs hatch can I breed the roo with the new hens of the new roos with the mothers? I would love to get a good solid line going. Also how do you know exactly what characteristics to look for in a young chick. I hear about people culling heavily in order to ensure a stock that is at least as good as the parent stock. Do you have to wait for the birds to mature? Thank you for any help or comments you may have.
Shawn

Also, don't be too quick to cull all the males with a little gold in the hackle. Most breeders of any black bird use one of these occasionally to keep the green sheen going. Blacks bred too long from the same strain tend to loose that sheen.
I wouldn't be surprised to learn that Mr. Smith uses some males with gold in the hackle.